David a



(No Model 11 LISK. BOTTOM FOR METAL FAILS.

No. 505,318; Patented Sept. 19,1893.

Fig. 1.

MJDW ZW UNITED STATES DAVID A. LISK, OF CLIFTON SPRINGS,

PATENT QFFICE.

NEW YORK, ASSIGNOR OF ONE-HALF TO TRUMAN V. FOX, OF SAME PLACE.

BOTTOM FOR METAL PAILS.

SPECIFICATION forming part of Letters Patent NO. 505,318, datedSeptember 19, 1893.

Application filed July 17,1893. Serial No. 480,708. (No model.)

To all whom it may concern.-

Be it known that I, DAVID A. LISK, a citizen of the United States,residing at Clifton Springs, in the county of Ontario and State of NewYork, have invented certain new and useful Improvements in Bottoms forMetal Pails; andI do hereby declare the following to be a full, clear,and exact description of the invention, such as will enable'othersskilled in the art to which it appertains to make and use the same,reference being had to the accompanying drawings, which form part ofthis specification.

My invention relates to bottoms for pails and other vessels and isdesigned as an improvement upon the device illustrated and described inPatent No. 47 6,280, granted June 7, 1892, to D. A. Lisk and T. D.Brown. In practice I have found that in making double bottom vessels ofzinc and tin that when the bottom is flat the zinc will buckle owing tothe natural greater tendency of zinc to expand, and while this defect isto some extent remedied by soldering together the zinc and tin plates,forming the bottom of the pail, as described in the patent aforesaid, itdoes not entirely overcome it, and furthermore the soldering takes timeand adds to the expense of making the bottoms.

The object of my present invention, therefore, is to simplify andcheapen the construc tion of the bottoms and to prevent their buckling,and to this end my invention consists in the construction hereinafterdescribed and more particularly pointed out in the claim.

Referring to the drawings, Figure 1, is a perspective view, partlybroken away and partly in section, of a pail embodying my improvement;and Fig. 2, is a vertical transverse section of the lower end of thepail.

Similar letters of reference indicate corresponding parts in each figureof the drawings.

A represents the body of the pail, preferably of sheet tin, and 13indicates the lower or outer bottom, which is also preferably of tin,and O is the upper or inner bottom of sheet zinc or other suitable metaldifierent from tin. Each of these bottoms is dished or concave as shownat a, and the upper one nests in the lower. Their edges are upset orbent and are secured to the lower end of the body of the pail in theusual well known manner. Theobject of makingthe bottom plates concave isto bring the pressure, caused by the natural expansion of the zinc plateG, to be extended inwardly toward the center of the plate and inadownward direction. The bottom plate B being of thin metal and havingsufficient elasticity, will yield to the pressure of the upper plate andso prevent buckling. Furthermore as the plates are not connectedtogether, except at their edges, they are free to move one over theother and this insures uniform expansion and stretching and contraction.There is a considerable dif ference in the natural expansive propertiesof zinc and tin, but-the greater elasticity of the tin plate enables itto yield when the greater pressure caused by the natural expansion ofthe zinc is forced against it, and both bodies being free to move, oneover the other, will be expanded equally and maintain a smooth anduniform appearance.

It is, of course, understood that the object of having the zinc bottomis to prevent the pail or other vessels from rusting.

While I-prefer to use sheet zinc for the inner or upper bottom I do notrestrict myself to its use, as any other suitable sheet metal havinggreater natural expansive properties than tin, and being equallynon-corrosive, may be substituted.

Having thus fully described my invention,

what I claim, and desire to secure by Letters Patent of the UnitedStates, is A bottom for pails and other vessels consisting of twoconcave plates of difierent metals, the upper plate being nested in andhaving greater natural expansive properties than the lower plate, thetwo plates being united at their edges only, substantially as and forthe purpose described.

In testimony whereof I affix my signature in presence of two witnesses.

DAVID A. LISK.

Witnesses:

WM. A. CLAUSAUEN, D. HATMAKER.

